Employee 401(k) Plan	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee 401(k) Plan	Employee 401(k) PlanThe Company adopted The Willis 401(k) Plan (the “401(k) Plan”) effective as of January 1997. The 401(k) Plan provides for deferred compensation as described in Section 401(k) of the Internal Revenue Code. The 401(k) Plan is a contributory plan available to all full-time and part-time employees in the United States. In 2021, employees who participated in the 401(k) Plan could elect to defer and contribute to the 401(k) Plan up to 75% of pretax salary or wages up to $19,500 (or $26,000 for employees at least 50 years of age). The Company matches 50% of employee contributions and was capped at $13,000 per employee in 2021. The Company match totaled $0.7 million and $0.8 million for the years ended December 31, 2021 and 2020, respectively.